I went from 265/70-16's Toyo Open Country's up to 265/75-16 BFG AT's, I experienced no rubbing with the Toyo's but the BFG's are rubbing the UCA and LCA, BUT ONLY ON THE DRIVER'S SIDE. I'm also experiencing a gentle rolling vibration from that side, but only intermittently. Also didn't happen before the tire swap. I bought them new from a reputable shop...

Weird. I am running 265/75/16's on my 14 with rims that have 4.5 backspacing and they are close but do not rub at all. I had tons of room with the OEM rims, but with the tire pushed out a tad more, I am really close in the upper part of the front flaps.

Might want to try swapping wheel/tires, left - right, vice-versa. It may be a tire issue. Sometimes there are inherent defects from the factory. Also might be a good idea to double check width with a tape measure on the tread pattern and also from the frame to the WMS and compare left - right.